Discussion

Explanation:

Given, Mon to Thur, (4 days) avg. Temp = 48°C

Thus, cumulative temp = 48 × 4 = 192°C.

Since temp, on Mon was 42°C

∴ Tue to Thur, (3 days), cumulative temp = 192 – 42 = 150°

Let temp. on Friday be x° C. 

Then from the problem, (150 + x)/4 = 47

⇒ x = 38°C

Hence, option (b).

» Your doubt will be displayed only after approval.